Spindle-bolster



2 Sheets-Sheet 1.

(N0 Model.)

0. H. CHAPMAN.

SPINDLE BoLsTBR;

Patented Apr. 27, 1886;

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(No Model.) 2 Sh eets-Sheet 2. G. H. CHAPMAN.

SPINDLE BOLSTER. I No. 340,658. Patented Apr. 27, 1886.

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UNIT D STATES PATENT OFFICE.

CHARLES H. CHAPMAN, OF GROTON, ASSIGNOR TO THE EUREKA SPINDLE COMPANY, OF AYER, MASSACHUSETTS.

SPlNDLE-BOLSTER.

SPECIFICATION forming part of Letters Patent No. 340,658, dated April 27, 1886.

Application filed February 23, 1886. Serial No. 192,765. (No model.)

To all whom it may concern:

Be it known that I, CHARLES H. CHAPMAN, a citizen of the United States, residing at Groton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Spindle-Bolsters; and I do hereby declare the following-to be a full, clear, and exact description thereof, reference being had to the accompanying drawings.

My improvements relate to that class of bolsters which contain all the bearings for the spindle and which are attached to the bolster rail or base at a single point only by means of a flexible connection located outside of or eccentric to the axial line of the spindle and its bearings.

My invention consists, essentially, in providing means for locking the bolster to its flexible support in such a manner as to utilize the torsional spring of such connection and thereby increase the cushion effect of the same upon the bolster.

It also consists in interposing an intermediate flexible connecting arm between the bolster and its support and in providing means whereby the spindle-step may be extended downward, so that it may have a proper length of bearing without coming in contact with the bolster rail or base except at the single point of attachment referred to. These features constitute improvements which I have made in this class of bolsters as heretofore made by others.

I do not claim, broadly, the invention of a bolster attached to the bolster rail or base at a single point only by means of a flexible connection located outside of or eccentric to the axis of the spindle.

Referring to the drawings, Figure 1 is a central sectional elevation showing the spindle and its sleeve-whirl, the bolster, bolster-base, bolster-rail, and flexible connection; Fig. 2, an elevation of the bolster and bolster-rail, showing the manner of applying or attaching the bolster to the rail without the use of a bolster-base; Fig. 3, a top view of a section of the bolster-rail shown in Fig. 2, and Fig. 4 a top view of the bolster and its flexible supporting-arm.

In Fig. 1 it will be seen that the bolster A is supported above the bolster-base B by means of the single flexible connection or pin 1), located outside of and eccentric to the axial line of the spindle s, the bolster and pin being joined together or connected by means of the intermediate flexible connecting-arm a, which, by its flexibility, operates to increase the cushion effect of the supporting-pin 1).

It is to be observed that the flexibility of the arm a is mainly in a vertical direction and operates to afford both the spindle and bolster a complete vertical cushion-a fact of greatimportance as a means to overcome vibration.

In order to lock the bolster to the supporting pin, so that it cannot move from its normal position, I apply a locking-pin, 2', near the top,

as shown, and I have found by experiment that when so applied the torsional spring of the supporting-pin p is secured, and a much more perfect lateral cushion of the bolster resuits than when the pin i is omitted. This feature, in connection with the flexible arm a, operates to sustain the bolster in a very elastic manner in all directions, and it is thereby enabled to carry the spindle at very high speed without vibration. In order that the foot of the spindle 8 may be extended downward to a point which will afforda sufficient length of bearing, I form the neck I) as an open tube or shell, in which the extension e may hang sus- 8o pended, but without contact with the interior walls ofsuch tubular neck. This construction permits the foot of the spindle to be carried downward through and below the bolster-rail O to any point desired.

In Fig. 2 is shown the means for applying this construction directly to the bo1ster-rail O, the bolster-base B being omitted, and a backward extension, 0, formed on the back side of the rail, to receive the supporting-pin p. This 9c form is preferable for new frames.

Haying thus described my invention, what I claim is- 1. A spindle and its sleeve-whirha combined bolster and step for such spindleprovided with 5 asupportingarm or extension having a vertical tube or socket and a supporting pin or stud adapted to fit within the said tube or socket and positively locked thereto, as set forth.

2. Aspindleandits sleeve-whirl,acombined roo bolster and step therefor provided with a verl to engage the said arm and support the bolster iical tube or socket connected to the bolster therefrom, and provided with an open tubular by means of an intermediate flexible support- I neck adapted to receive the said downward ing-arm,andasupporting pin or stud adapted extension and permit it to pass downward 15 to fit within the said tube or socket and s11 l through and below the same without contact port the bolster therefrom, its set forth. I therewith, as set forth.

3. A spindle'and its whirl, e bolster there for provided with a downward extension to receive the foot of the spindle and having a supporting arm or eXtension,-and a bolsterbase having a supporting pin or stud adapted CHARLES H. CHAPMAN.

\Vituesses:

J AMES it. GRAY, \VILLIAM BROWN. 

